package 树.BST;

public class ListNode {
    int val;
     ListNode next;
    ListNode() {}
   ListNode(int val) { this.val = val; }
   ListNode(int val, ListNode next) { this.val = val; this.next = next; }

    public ListNode(int i, int i1, int i2, int i3, int i4) {

    }

    @Override
    public String toString() {
        return "ListNode{" +
                "val=" + val +
                ", next=" + next +
                '}';
    }
}